You are absolutely acting within the lines or racism. You didn't ask for an opinion, but when you're too comment and child comments are all supporting very clear racist actions and ideas, you are being a problematic person.

Consider how upset being called racist makes you, and imagine how a black person must feel to hear they are perceived as violent due to an interaction some random white person had with a person of color they've never interacted with.

You feel singled out because of a comment you made, black people are being singled out because OP interacted with like, 3 or 4 and decided to base their perception of race on that.

Racist.

Refusing to call racism racism, is racist.

You insist on tip toeing around the word racism. That's pushing it. That's really pushing it.