Does anyone else see mistakes in some manga and just pretend not to notice it?

（￣へ￣）Well I always see a few mistakes in manga and just try to ignore them and I don't really know why I do that I think its become a habit now, because when I read manga my friend that reads with me points out "easy to spot" mistakes that I didn't notice. Can someone explain why I might do this?(〜￣△￣)〜 "help me plz" ( "____" ) "why should I ?"
(づ￣ ³￣)づ "will you take the bribe brother" (<.....< ) "I think your pathetic"
╥﹏╥ "I hate u"（￣へ￣）"Fine"
Σ(っ°Д °;)っ "really" ╮(￣▽￣)╭ "it's simple just ask online"
(●'◡'●)ﾉ "bye i'll come back for living off of u" Σ( ￣□￣||) "you're ugly"
(╬￣皿￣)凸 "what did you say" ლ(´ڡ`ლ) "you heard me ugly"
(〜￣△￣)〜 "tsundere" (⊙…⊙ ) "bye ugly"
╮(￣▽￣)╭ "bye my loving brother" ╥﹏╥ (tears of joy she's finally gone).