Record everything in writing, time, place, witnesses etc.
In the meantime don't retaliate but be polite with a "Thank You" as already suggested...nothing annoys a protaganist more than forgiveness.
When you feel you have sufficient evidence, witnesses etc. approach the manager/owner and present your case.
Should all that fail, sort it out man o man outside of work.
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Wise men speak because they have something to say; Fools because they have to say something.
Oh my God, not again!!
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