https://www.theoffside.com/world-football/adrian-bastia-sent-off-for-tripping-a-pitch-invader.html?utm_source=feedburner&utm_medium=feed &utm_campaign=Feed%3A+theoffside+(The+Offside+-+International+Soccer+News+Blog)
I know this is quite old (2 years) but I just found this browsing famous pitch invades and got pretty stunned. Didn't know that rule existed..
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FIFA Rules say, whoever commits something like that, may it be an assault, tipping a leg, or whatever, against a player from the own or the other team, the officials, the marshalls or anybody on the court or in the stadium whos part of the game (so are the fans) is punished with a sent-off.
Thats just unsportsmanlike behaviour by the player, streakers are business of the marshalls and police.