Is it bad to read highschool of the dead??

it's not weird for girls to read highschool of the dead right? Welll..., one day little old me was just sitting reading high school of the dead when suddenly a rude friend of mine snatches the book from me and says "You're not supposed to read playboy at school!"...... i know that it isn't a child friendly kinda manga but it's not that bad is it??? then again ive never been one too see the bad iin things till someone points it out to me..... on a lighter note i enjoy the art style and story...
i don't have many otaku friends so this was an extremely hard fight to win... he said that its just cartoon p#rn and that i should be ashamedd to read it so publicly and i kinda just sat there like "dude, chill its just a manga about zombies and boobs.. nothing to get your knickes in a knot over.." but that'll teach me not to read harem manga in public ever again but seriously, i was in the back of the library where not even the ghosts would gather so why would he get soo pissed about it??

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