A draw is not a bad result for Barcelona, moreover, they come as guests and the opponent is Sevilla. They should have taken advantage of the red card received by Sevilla, but Sevilla is not an opponent that can be defeated easily, and in this match, Sevilla played quite well (it's a shame that Jules Kounde did such a stupid act).
I agree that this is still not a bad score for Barcelona. But they should be unhappy about not being able to benefit from Sevilla's playing with ten players for around half an hour. Sevilla resisted them very well which deserves to be appreciated much. Sevilla wasted a big opportunity to decrease the point difference with Real Madrid to 3 too but it is still 5 now. As long as they fight till the end, they could have a chance for the lead.