"Jack, if established members accused you of being a racist, and of making racists posts, would you just let it go or defend yoursef?"

Many, have done so, many times. I have learned to respond clearly to the allegation, maybe repeat that to be perfectly clear, then, usually, I quit responding.

But again, you miss the point.

McGrath said this.

"This is a daft squabble, which feels rather disrespectful to the awful thing that has happened.
I'd suggest that a little lip-buttoning would be a good idea."

You said,

"quite right."

If you agree that it is a "daft squabble", and "disrespectful" why continue under any conditions.

Are you "daft"?
Are you purposely "disrespectful?"
Do you LIKE to "squabble?"