Abbas is the one who crossed the RED LINE by not accepting Jews in his future state. By the going to UN without sitting down with Israel, is crossing the red line. Joining with Hamas whose charter says the destruction of Israel is crossing the RED LINE. Israel is builiding on disputed land not Palestinian land. As for Abbas he is building settlements all the time and the world says nothing.
Two mortar shells explode in Golan Heights, no casualties or damage reported (Haaretz)
from the article: Abbas: Israel's settlement plans in area E-1 are a 'red line'