My[18M] brother[20M] and I shaved our heads in solidarity with our mother[38F] who is battling cancer. A lot of people, including my gf[17F] seem to think that we are mocking our mother's condition and that we shouldn't have - are we?

I think this is a stupid problem to have but I am going to ask you to be the judge.
My mom has cancer and she has been fighting with it for a while now. As a result, she has lost her hair and has shaved her head. I should point out that my mom is a very pretty woman that has always tried her best to look good. Her hair was always nicely done, she has a lot of make-up products at home that makes her look good and even without using them, she still looked pretty.
But now my mom is very self-conscious of her looks. She doesn't let people see her, she is always worn out because of the therapies she is going through and rarely goes outside. She wears a hat that covers her head and even at home with me and my dad she doesn't remove it. I feel really sad about my mom, she used to be the opposite of that. She was very outgoing very talkative and nothing phased her. But now it's not like this.
My older brother recently came up with the idea of us shaving our heads to like show solidarity with mom. He also noticed how mom was acting so he wanted to show her that she is not alone in this and that we are here for her. That she shouldn't be ashamed to show herself in front of us and to feel supported through this.
I thought it's a great idea and we went ahead with it. We shaved our heads and when mom saw us, she started crying and just hugged us. I think she liked it and we both felt really good about it. Dad also said it's a nice gesture and that he might as well do it himself. All in all, I really think we did something nice for mom and that she appreciated it, even if it's something as small as this.
The problem is that other people don't see it that way. Apparently, my brother and I are mocking my mom and we shouldn't have done this. We've been told off so many times that I lost count. People just don't seem to get it why we did this and it's infuriating. Various family members have said that this is stupid and it does nothing but to make my mom feel bad about herself when we thought it's the exact opposite.
Even my gf (17F) thinks this is not okay. She said that she liked me better when I had my hair (I've been told numerous times that I have a very nice hair and it's part of my charm) and now doesn't really want to be seen with me because apparently, I am "making us look ugly together".
So good people tell me, are my brother and I bad sons for doing this? Are we mocking our mother and making her feel bad about herself? I don't think this practice is common in my country but my brother said he read about people who do this in other places and thought it will work well. I am really struggling with this idea that we did something we shouldn't but my mom's reaction was genuinely happy and didn't seem to be offended or anything. But maybe I am wrong, who knows.
tl;dr my mother has cancer. She has lost most of her hair due to the treatment and has been extremely self-conscious about her looks ever since. She has shaved her head and doesn't really like being seen without the hat she is wearing. My brother and I decided to shave our heads in solidarity with her and to show her she doesn't have to be ashamed to show herself in front of us and that we support her in this. I thought she liked the gesture we made, but a lot of people have been telling me it's the complete opposite of that. That we are mocking our mother and make her feel bad about herself. Even my gf thinks I shouldn't have done it and now doesn't want to go out with me anymore.


Source.