I am tempted to say that a few people will have to respect him, because Randy, even coming out of retirement, is a great.
But most will come up with a way to ignore it. Some will ignore the evidence (i.e. they will just keep saying "he's fat, he talks sh*t, fights defensively and soils himself", ignoring his record and the fact he is obviously a good kickboxer, as usual). Some will try to minimize the significance of the evidence "Randy's old", "Tim is just a bad matchup for Randy", "Tim is just big".
A lot depends on the fight. If it is a 5-round, amazing fight where they put it on the line I think he will get respect. Because the average MMS fan, including hald the people here, has the memory of a goldfish. "Not human" one week, "can" the next.