I think both of you have a point.Are you not an older white man who just talked about racism? Did you not just lecture about being dismissive, while...being dismissive?
Seriously, the excuses people use to not listen to potential dissent before dismissing that dissent is disappointing. If the color of their skin makes you think they cannot have an opinion worth listening to, maybe that's your issue and not theirs. If their age alone makes you think they cannot have an opinion worth listening to, maybe that's your issue and not theirs. Perhaps judging them on their color of their skin or age is not an admirable trait you should be using, in itself, as a means of declaring a human's opinions not worthy of consideration?
I think you are right in that using someone's age or skin color as a reason to not listen to them is rather silly and dismissive. Everyone can have a say.
But at the same time I think Umbran is right in that if you aren't a part of a group that is claiming a problem, your voice doesn't get to have more power in the conversation in order to say the problem isn't real. We should take your outsider status to this conversation with a grain of salt. I'm not saying your voice shouldn't be heard... but we should at least acknowledge that you aren't necessarily seeing things truly as they are because you aren't inside the situation. And hopefully (general) you can recognize that while you might try to visualize walking in another person's shoes... you aren't ever going to be actually wearing them, so don't make definitive statements on whether or not they fit.