Is that common to block people when you do not like her/his job and age?
A guy named "David" asked me my age and job. I said I do nothing for a living cause I use to work at the bank but I am having breaks for now. But right after he receives my reply, he said ok and blocked me. I feel so upset.

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He's probably just a weirdo. Don't feel bad about it.

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that is a little strange. i think you need to question his reasons for being on this site

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Don't feel bad. He was probably looking for a girlfriend.

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You can block anyone who makes you feel uncomfortable. No need to feel bad about it or explain yourself.