I did something similar once but failed to glean such a valuable lesson from the experience. My takeaway was, those people are touchy so leave their shit alone. Not because it’s right but because I’m just trying to get through my day, and i don’t need more politics in my working life. People can be assholes, it’s just how it is sometimes so let them be.

Among my own team, if I raise points or ideas that get disregarded in this manner (as opposed to more thoughtful demurrals), I let it go and don’t push the issue. I’ll speak up if I think I have something worth considering, but I’m not going to beat you over the head to see things my way.

Still, the takeaway regarding being on the other side of that table is really important. Once you start feeling that indignant reaction or “yeah right newbie”, listen harder.