I think this is where the coach has to step up and make the limits known to the older players loud and clear.
If the Coach has worked to recruit a good bunch of players he sure as heck doesn't want them physically hurt or abusing alcohol.
Good natured kidding is fine, but that is where it stops.
I know of a player who was told he would be shaved in parts that normally don't get shaved and had to get drunk. He replied you can shave whatever but absolutly I will not drink alcohol, He stood his ground and everything worked out ok & he was accepted.
CV
"It's what you learn after you know it all that counts."
Earl Weaver