WATCH: Demetrious Johnson believes Conor McGregor made a huge mistake at infamous UFC 202 press conference

Conor McGregor is way too emotionally invested going into his rematch against Nate Diaz, according to flyweight champion Demetrious Johnson.

"He walked in like he was the show, but when I walked out the show was over, so who's the show?" - Nate Diaz, UFC 202 Embedded. If you didn't catch the UFC 202 pre-fight press conference the other night, you certainly missed out on... something. Diaz didn't take too kindly to McGregor showing up fashionably late at the presser and after he had answered all his questions, he decided to get up and make a dramatic exit. The two main eventers then began shouting trash-talk at each other as Diaz went for the door while his team and McGregor became involved in a childish bottle/can-throwing war that Dana White claims could have serious repercussions for both fighters. https://twitter.com/SportsJOEdotie/status/766014616476475393 Gamer/P4P king Demetrious Johnson was on his Twitch channel doing a live reaction to the fireworks on display in Las Vegas and Mighty Mouse believes that McGregor certainly came out second best in the exchange.

"Aw man, that's not good, man. Conor's got to be able to handle himself like a professional. People are going to say so much shit to you when it comes to fighting, so much shit." "The best thing you've got to do is stay composed, like 'Dude, yeah, you know? I'm not interested in fighting your whole team.' That's why usually when I fight I've got three motherfuckers with me. One of them is Matt Hume, other is Brad Kertson and it's me, my little black ass self. Other than that man, I don't roll with a whole fuckin' crew."

DJ believes that McGregor's reaction was indicative of his emotions getting the better of him and that could affect his performance come fight night.

"I don't want to see Conor get emotionally invested in the whole trash talk against Nate Diaz and the Diaz crew because that's going to play  a factor when it comes to the fight. He needs to go in there calm and collected. Dana honestly sounded like a mother with an ot of control child in a grocery store. 'Conor don't throw that. Conor don't throw that.' (laughs)"

We won't have long to wait to find out if McGregor is too rattled to get the win, with UFC 202 set to go down in the wee hours of Sunday morning. The first time the two did battle at UFC 196, the Stockton native got the win by outstriking McGregor over two rounds and eventually sinking in the rear-naked choke (after punching McGregor's head into position)  and forcing the tap in the second round. https://www.youtube.com/watch?v=WraF6ECgT1Y&feature=youtu.be Massive Mayo v Tipperary preview plus a big interview with Eamon McGee in the latest GAA Hour. Subscribe here on iTunes.