The picture humorous because we live with socially conditioned beauty standards that dictate that female identifying humans who don't rid themselves of naturally occurring body hair are to be considered unattractive and/or subversive.
You’re good. The person who posted the photo of themselves initially did so clearly in good humor, you shared it here clearly in good humor. Person you’re replying to is just getting fired up for something that is just purely silly and fun and not serious.