So, lots and lots of people are blaming immigrants for all our problems. I'm not sure rich white men need you to defend them to a random on the internet, they are doing just fine.
When someone says "everyone and their dog", they don't mean that the dogs are also participating.
Basically you failed to charitably interpret the person you are responding to and are now insisting on a reinterpretation that makes you look silly.
I mean think about what he wrote before that. "I look forward to", he is talking about the future in a sarcastic tone so the president being a counter example is his point. You're pinning him down onto the present and that is a strategic mistake.
I don't really view internet comments as "strategic" like you. I was simply clarifying that this person's world (social media, news, friends, etc.) may give them the impression that "everybody" is blaming this group, but in reality that isn't true.