How is it that there are like 10 people arguing and I can't find a single person I agree with enough to join their side?
Chopping is not a fundamental right. You get to do it sometimes and you don't sometimes. You get to control it sometimes and you don't sometimes. It's probably best classified as minor collusion but the biggest loser is the house so unless they complain, really, it's about two grownups communicating their intents clearly and taking the intersection of their desires.
You can offer any kind of selective chop you want. Some people develop a code where they complete and check it down if they both have jackpot hands. Some people will chop with strong players and play weak players. Some will chop 6-handed but play 5-handed. The popularity of such moves can be debated but whether one should be allowed to do it is unquestioned. Again, just make clear what you want and stop relying on unspoken "rules."
If you can't figure out how to tell if someone looked before they offered you a chop, I don't know how you manage to get to the casino with fully tied shoelaces. One method that works for me is to ask/tell before the action is on SB.
But if you're really that scared of being branded as a beta cuck if you open your mouth to let out a few squeaks, use this guide: people in loose games tend to chop. So if your opponent is selectively chopping his bad hands, you will either find out very quickly (because a tight game has lots of BvB battles and you shouldn't be chopping anyway) or it won't matter (because the issue just won't come up very often in loose games and you should be chopping anyway). If you game start at a new casino and draw the SB and first hand it's folded to you and it turns out the BB is a selective chopper and dicked you out of a BB, PM me and I'll refund you the money in return for my horrible advice.