By Jude Summerfield Mikel Arteta admitted his Arsenal side dropped their performance levels as Southampton fought back to earn a draw on Sunday. Granit Xhaka had given the Gunners the lead with a well-taken finish from Ben White’s cross, but Stuart Armstrong brought the Saints level by firing beyond Aaron Ramsdale as Arsenal dropped points for just the second game in 11 outings. Arteta’s side remain at the top of the Premier League table with a two-point lead over Manchester City and the former midfielder said he had no disputes over the final result. “No complaints. This is football. We were …