Why does my boyfriend get defensive about this?

Anonymous
I’m usually pretty secure in my relationship. So I have a boyfriend that goes to the gym daily and once we were talking on the phone and he said he was showering and putting on hair gel before he goes to the gym.
I jokingly asked him why he was showering and putting on hair gel just to go the gym and he basically got offended and was like “would you just let me be?” He then started acting like I’m always coming down on his case when I jokingly asked him why he was doing something that doesn’t make common sense and he said he likes to look/ feel good at the gym for himself. He also does it at work and works a maintenance job which also doesn’t make sense to me but I never questioned him about that. He had mentioned that the office managers at his job are women and he’s said they’re pretty before and dress in short skirts and stuff but i don’t care because it’s just an observation but I’m starting to wonder if he does it for them lol.
Am I overreacting or should I just let him be?
Why does my boyfriend get defensive about this?
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