One person saying it could be their problem. Four people saying it is a pattern with your name on it.

Dismissing feedback one source at a time is easy and can continue indefinitely, since every individual critic has some flaw you can point at. What that method never does is add anything up. Four separate people arriving at the same observation is a different kind of fact from one person having a bad day with you.

Keep a rough tally rather than judging each comment on its own. When the same note reaches three, stop assessing the messengers and look at the message. You do not have to agree with it in order to take it seriously.