Is it such a problem to be polite and text instead of ignoring?

I was supposed to hang out with my acquaintance but he's ignoring my messages the whole day. Is it such a problem to be polite and normally cancel the plans instead of ignoring?

Why do some people do that?

It's so annoying because I could have planned something else with someone else

Is it such a problem to be polite and text instead of ignoring?
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