Why do people ignore their friends/partners/people who message them?

I don't know why people ignore the messgaes they get from others... I.e someone's friend/partner has annoyed them but instead of talking about the issue they ignore them... I think that's very rude of the person... The person who is being ignored would feel hurt from being ignored... I got ignored by someone on a website... This is how it went:
Me: Hello, how are you?
TEN DAYS LATER...
Me: I don't know why you ignored my message, just becuase I said "Hello, how are you?" it doesn't mean you can be rude and not reply, I was just doing what people do, saying hello and asking how the person is.
Person:Wooow youre so sensitive. Cool your tits man.
Me:I'm not sensitive, I'm just a person trying to use this site as it was intended to be used, to make friends. I'm not someone who goes around ignoring someone, I regard that as being extremely rude.
Person: I regard you as being extremely rude. Now please, stop messaging me.
Me How am I being rude? You didn't reply for 10 days.
Person:I dont reply to every message sent to me. I dony have to. Its not being rude. I dont like messaging people.
Me:Yes, it is rude to ignore someone's message, it's more polite to tell the person not to talk to them.


I don't understand how someone can just not reply to a message.

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