My question/answer is, "Do you care what these guys think of you?" or "Do you care about the rules and playing a fair tournament?"
You are right to call a violation, especially if it actually gives a person an advantage (I wouldn't be too concerned if the player really sucks, has no chance of winning a single thing and is just there for fun). The other guys are wrong to act like 12 year olds and throwing it back in your face.
The biggest problem is, what will the TD actually do about it. It just becomes your word against theirs and forces the TD to make a very difficult decision - one which will probably be to just say, "Sorry" and let it go with a warning.
You are not crying unless there are tears, you are standing up for the rules.
2013 STLDGC Tag #107
2013 SCCDGC Tag #78