Is my mom wrong for this? (RANT)

I was bored and I asked my brother if I could do his makeup. He lets me do it and it's fun. I didn't see anything wrong with it so I did. I was just doing his eyeshadow when my mom walked in to check on us. She asked what I was doing and I said I was doing his makeup. She replies with "I wish u wouldn't do his makeup" and she's my mom so obviously I should respect her on what she does and doesn't want me doing. And I'll take my part in not doing what my mom wanted, but I asked why. She said he just shouldn't be wearing makeup so I said that makeup doesn't say only for girls on it and that she never told me I shouldn't be wearing makeup so how is it any different with him. She doesn't say anything for a second and says "just stop" and walked off. And if it's important one or two years ago she told me she didn't want me to do his makeup cuz she doesn't want him to be gay.(I also did his makeup then too. Lol) Now this was two years ago and I didn't remember until just now I wouldn't have done his makeup if I remembered she didn't want me to but honestly I think my brother should be able to wear makeup as he damn well pleases. Tell me ur opinions though! :)