old man +1
Saying that one shouldnt go to a sports game because of shemiras einayim or other religious reasons is fine by me as long as it isn’t being imposed. However there are many rebbeim who engage in a great degree in sophistry in this area. Telling kids or even adults that playing or watching sports isn’t enjoyable is counterproductive as even a 7 year old can see that isn’t true. I remember a rebbi lambasting sports as a kid (i believe I was in 1st grade at the time). he said that he could invent a game in which he threw papers in a garbage can. Even at the time I realized that was faulty logic and most other kids would be able to intuitively realize that too.
As far as chukas hagoyim goes we have to be very careful not to overstate what is wrong with doing something and what is halacha and what is chumra. Stating that chumra is halacha will cause people to be derelict in halacha for many reasons. It is a dangerous direction to go in. To be a rebbi rav or r”y you have to have seichel. There is also a question of gezeira sheain hatzibur yachol laamod bah. You have to allow some outlets and places for families to go to. There is a vast difference between what people can/should do on a personal level depending on where they are at and what rabbonim should be lecturing or enforcing at a communal level.