US President Donald Trump's son, Donald Trump Jr., slammed critics complaining about "Obama's FCC chairman" voting to dismantle net neutrality rules this week and suggested that most commenting on the issue may have not even heard of the regulations before.

He was referring to Ajit Pai, chairman of the Federal Communications Commission (FCC), who was elevated to the top role in January by his father during his initial days in the Oval Office. Twitter grabbed the opportunity and mercilessly roasted Trump Jr over his comments stating, he "desperately needs to get his facts straight".

"I would pay good money to see all those people complaining about Obama's FCC chairman voting to repeal #NetNeutality actually explain it in detail," Trump Jr tweeted on Friday (15 December). "I'd also bet most hadn't heard of it before this week. #outrage."

Net neutrality rules were implemented during former president Barack Obama's tenure to ensure equal access to internet services and prevent service providers from blocking, slowing down or speeding up certain content or charging customers additional fees for high-quality streaming and other services.

On Thursday, the FCC voted to repeal Obama's landmark rules in a 3-2 vote that fell along party lines despite massive backlash and criticism, particularly from Silicon Valley. Pai, who was appointed to a five-year term on the FCC in 2012 by Obama, too was at the receiving end of the backlash.

Twitter users could not overlook Trump Jr's glaring misconception involving Pai's appointment to the top FCC post and immediately pounced on the opportunity to roast him. He was also trolled over the fact that he spelled "net neutrality" wrong in his tweet.

"He's your dad's FCC chair, not Obama's. I seriously wonder how you manage to dress and feed yourself every day," one Twitter user wrote.

"You really are quite dim, aren't you Jr?" another chimed.

"Prior to the proliferation of high speed Internet there wasn't much need to enforce neutrality, and once it became prevalent in the early '00s the FCC assumed ISPs would largely avoid discriminating among traffic. Well that wasn't the case," a Twitter user explained in a series of tweets.

"When Obama took office his FCC decided it would take regulatory action to prevent this from happening, so they put in place the Open Internet Order of 2010 which among other things prevented ISPs from discriminating among traffic.

"Now it's 2017 and the FCC wants to give these ISPs the right to discriminate among web traffic. Now, you might say that the 2015 rule stifles competition and decreases investment. Well, I'd say that the physical backbone of the Internet (which the ISPs run) really should be treated as a public good.

"Think about the millions of people who work for software, ecommerce or other technology companies. Livelihoods depend on cable companies treating them fairly. Anyway, you're a f**king moron," the person added.

"First of all it's neutrality. Clearly spelling isn't your strong suit. Considering your FATHER appointed Ajit Pai and not Obama, I guess intelligence isn't your strong suit either. #dotard", a user added.

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Donald Trump Jr. said "Obama's FCC chair" Ajit Pai voted on the repeal of net neutrality rules and Twitter blasted him for the incorrect assertion - File photo Ethan Miller/Getty Images