Is it weird that my [35m] friend still eats his boogers and was i wrong for being surprised?

hi im just asking bc he got super offended and angry when i subconsciously made a shocked face at him when i saw him do it. he claims it's ' perfectly normal'. [i do find it odd at his age but whatever floats your boat i guess]. i said i apologize for embarrassing you if i did, it wasn't my intention, i was just surprised to see that. then he started saying 'you do gross shit too' when i asked what he said that i leave my used tampons in the bathroom trash! firstly wheres else am i gonna put it and second i'm such a clean freak that i wrap the hell out of any used sanitary product and put it in the bottom of the trash where it can't be easily seen unless dug up or dumped out bc im embarassed ab anyone seeing it. also i take out the trash in there every time for that reason too so he never has to during my totm.[ honestly not gonna repeat the rest of what he said bc it's honestly made no sense and was just degrading/ out of proportion for my reaction to sum it up]. is it normal to do that? and aitah for being surprised?