The Clearances weren't just the doing of English landlords. There were Scottish landlords in there as well, and some of the worst. And the same kind of thing was true in Ireland.
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It's not bigotry to be cautious of strangers in some situations. If I'm out late in a lonely place I might well be apprehensive of a bunch of young men up ahead. It wouldn't make any difference to me if they were black or white, but I can see why it would to many people, or in certain settings.

Bigotry is more than suspicion. It's when that suspicion turns into belief and a motive for action.