I wouldn't call what Silva did as being disrespectful necessarily, he just did'nt have any other way to win the fight so he tried his best to dance around and taunt Weidman so that Weidman would make a mistake.
Apparently Silva also shouted to Weidman in between rounds to keep the fight standing because it's what the fans wanted to see, clearly after the first round Silva wanted no part of Weidman taking him down again. Weidman then proceeded to rock Silva's world while standing up with him, both by evading Silva's strikes and Weidman landing with his. The best part about all this is that Silva did'nt even land a punch the entire fight. Weidman took it to Silva on the ground and at Silva's game standing but what really stands out is that Silva could not do a thing about it.