No, I'm not lying it is a subjective observation and I'm not obliged to prove anything I don't have the time to waste in that respect plus your username seems to present some search difficulkties. I was wrong about the Burns thread, but as I said 'iirc' many of these instances are going back over the years, the recent trolling wasn't however.
As for the explanation, well it would depend on your definition of racism really, but I feel it has been partially explained above.
I'm not out to sink the teeth into you, but don't start acting like an impervious yuppy with me. Especially when it comes to banding about 'prejudice' so strongly.
Not nice, is it?