This happens to me allot, especially when in larger groups.
For my part though, I don't think it is entirely the other people being rude. It takes allot of work to stay 100% present during the conversation, tracking when to laugh, eye contact, make or mirror a specific expression, insert random detail clarification question ("was that the same girl that ___"), emphasis statement ("there is no way that he could have said that") or continuation question ("so then what did you do","how did ___ take that" ect.). Its like constant reinforcement that you enjoy their story.
I find that if I can religiously stay on top of such things I stay visible, but takes allot of effort and is not always worth it. if I miss out on more than a couple rounds of others in the group exhibiting this behavior though, I begin to disappear. If a couple more rounds go by without input, I won't get let back into the conversation without specific natural openings or someone pausing the conversation to let me back in as a favor.
NTs seems to have very fragile and demanding egos, if you don't give it the right type of pat on the head once a minute, it will start hold a grudge.