Not if you target the monster that they aren't fighting.

lets say you are fighting and they are numbered.

1. lizard <---- people are on lizard, if you fluid this and knock it back while people are fighting yeah I think its rude some have timers on moves that could expire if they couldnt get the hit off like dragoons, have to consider that on other hand if the monster is doing a AOE no its not rude rather it be knocked back to make move not work than to get hit by AOE.
2. rat <----- this would be ok
3. bandit <--- this would be ok

Reason lets say your a mechanist you shoot the bandit knock him back you can use Bind and lower the damage tank is taking. So that would be fine.