I think most fair-minded fans will accept it if a team changes its tactics in order to become more difficult to beat, often having to sacrifice the style of play to a more pragmatic one.
Clearly Arteta has seen the team as being too easy to be got at, and thus changed his structure and approach. No real criticism of that imo.
However, what he has done since is to adopt the blatant time-wasting, play-acting tactics that disrupts the play, allows informal touchline coaching/instructions, etc.
This for me is where he has clearly decided to bring such tactics into their game, seeking to help make them more robust as a team. He will feel justified in this change, whereas to supporters of other teams, this is just crude and unacceptable excuses for his win at all costs approach.
Added to the fact that arsenal as a club are clearly one of the main drivers of the PL's constant attacks on City, the hateful 8 letter etc, hypocrisy of their sponsorship alignments etc all add up to a distasteful aura surrounding the club as a whole.
I don't honestly understand why Pep can see behind the mask Arteta wears and still believe him to be a friend.
His actions, and those of the club are pretty shabby imo for a club of their " standing " and with a history of such good football in the past, despite Wenger's constant moans about us.