Why is mongrel used as a slur?

It's always used in the context of calling someone ugly when the actual definition just means mixed. Why is there so much "Mongrel" hate even when the mix isn't 50 50?
Pic related

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Jews will often call people like venti mongrels to divert from the issue at hand.

As a hot race mixed mongrel I couldn't care less and neither should you.

>using 6 filters just to look white
>still don't look white

BREAKING: PADDOCKS ACTUAL NOTE RELEASED, SHOWS BULLET TRAJECTORY CALCULATIONS AS WELL AS OTHER PREVIOUSLY UNKNOWN MISCELLANEOUS INFORMATION

She's part of the issue

This is the smoking gun.

>finns and jews will bring it up

I stand corrected

Because they are fucking ugly as shit.

lol she wouldn't fuck your ugly pasty ass if you were the last two on earth, edgelord.