Blowing your nose at a restaurant.... Is it ok???

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This happened quite a few times while I was at restaurants with differant people. we are sitting there eating and enjoying our food and all of a sudden some guy starts blowing his nose! it's like, Hello!?!? yuck! and then there are those guys that blow their nose and sounds like they are blowing a trumpet or something. lol why cant they step in the restroom??? have courtesy for other people! lol