Guy lied to me about age?

This happened a while back but I never got answers. We met in a game online, became friends, then started getting to know each other and flirting in dms. I was 21 back then (turned 22 last month) and he told me he was 26. Now, that age gap is already stretching it cause I prefer someone closer to my age, but I still gave him a chance because in the end character and chemistry is what matters most to me.

Later on however he confessed that he was actually 28. Ngl I was quite shocked, hurt, and suddenly highly uncomfortable. If I knew he was 28 to begin with I never would've gotten intimate with him. I asked him why he lied and he said that it's just 'his thing'. He claimed that he always responded with the same number even when he was my age. Basically he's saying it wasn't a big deal and it was some sort of joke or something.

I don't get it. I cut contact with him, but I still don't get it at all - was he just fooling around or is there some ill intent going on here? And if he were just joking, how does anyone find lying about age to be funny?
Guy lied to me about age?
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