Lol, your ds is going to totally rebel once he turns 18, buying the rudest t-shirts he can just to shock you! Like fcuk t-shirts with vintage pin up girls legs akimbo saying finger licking good!
Your ds is 13, he is not 5 anymore , however most five year old boys would be delighted with your ds’s choice.
My dh was your ds, he was forced to wear the same shirts mil bought for fil from m&s, he was bullied horrendously because mil had to control everything, his clothes and his glasses. We went shopping Together not long after we met and I encouraged him to pick whatever he wanted. In a fit of rebellion, he bought that fcuk t-shirt I described above. It fit like a glove and he looked his age instead of 55!
I thought he looked hot, he looked confident and happy, my parents thought it was hilarious but having two adult sons at home they were more than used to it! Mil predictably hit the roof, demanded he take it back and shouted at me saying ‘how dare you let him buy that!’ Which spoke volumes! I am now many years later a Mum to an 11 year old and if my ds wanted to wear a t-shirt with the poo emoji on I would buy it for him. As it is my ds is not in the least bit interested in emoji’s! He
My dh was 25 when I met him, yet his Mother treated him like you just treated your ds at 13. Don’t be like my MIL, there lies rebellion, a destroyed relationship and eventual no contact. In my experience it is those teenagers who are controlled the most who rebel the most. There is no shock factor in buying a rude t shirt if you let your teen express themselves.