Ok, there are scrambles in golf where everyone tees off and you hit from whoever hit the best shot. Scores are low. I have had people tell me the shot a low 60 playing a scramble. Nice score. Do I think think they are a pro golfer, no. Do I care if they think it is an impressive score, no. Say congrats and move on.
Same thing here. If a bowler thinks there no tap 300 is great. Good for them. If they want to "brag" about it. I let them. I have had people tell me they shot an 1138 game. I say good job and move on.
If someone is telling you about their score, for some reason they look up to you, or want your respect or acknowledgement or they are just showing off. Whatever, the reason, the world of bowling is a better place in my opinion if we all say "cool, I hope you keep bowling" and move along.