It's been alluded to in other posts, but this ends up falling in the realm of what the APA rulebook calls Sportsmanship violations.
If you're just starting out in APA, you're going to deal with a whole lot more than having an opponent switch cues for a shot to get an edge. Wait until you start dealing with timeouts that run quadruple the "suggested" one minute. Or having the other team have people signaling their 2 about what shot to take without wanting to call the timeout to do it. Then there's the ridiculous sharking stuff some people do during a match. Most of that isn't worth the aggravation, so you just let it go. It's like calling a push shot in a match where two raw beginners are playing, sometimes you just got to let them play and work it out themselves.
You'll quickly learn who the people in the league are that constantly cause problems, and are not reputable. Sometimes they're damn good shooters too, but ability and integrity are different measures.
If you are truly concerned about this happening, then you're following a good path by asking first, even if you don't like the answers people are giving. Good for you for staying in front of it.
If, on the other hand, you are trying to get answers for what people might say if/when you swap cues for a jump or a masse, then you'll be "that guy". For me, I play by my standards, and try not to let other people's antics get under my skin.
I've been a part of some lively discussions on league night about rules, and I have to say that even when we didn't find common ground, I wouldn't even take the first step into those discussions unless the other person had integrity. You'll find those are the people that agree to disagree and move past it. It's the lowlifes that never let it go. Kind of a King Solomon type of thing.