On the other hand, I agree with you. I see some people saying "interruption is ok". I disagree. It has to be an exception reserved for keeping the meeting on track. The normal course of things should be that everyone gets their turn to say their bit or to "pass". People who aren't able to wait for their turn or take too long typically will understand if you/the-manager have/has a brief chat with them later (or the person who called for the meeting should bring them back on track).
You do need to time it right to get the word in, but you can’t wait for a silent moment.
It’s like merging on the highway. You can’t wait for all cars to stop. Have to time the merge correctly and force your way in, even if nobody is letting you in.