Matt Gaetz is entitled to his opinion but that is all it is, one man's opinion.
Mike Johnson, unlike ANYBODY else including McCarthy, got 100% of the GOP vote for the nomination, and 100% of the GOP vote to be Speaker. Despite being a Trump supporters and hardline conservative, he got a standing ovation from both GOP and Democrats when the vote was in and he officially became Speaker of the House.
Petty and mean spirited attempts to tear apart what has become a unity and good thing in the House of Representatives, to continue to stir up discontent and angry feelings, does not reflect well for anybody doing that whether left/right/Democrat/Republican.
Nobody focused strictly on partisan politics and advantage gives one damn about the American people or how government serves the people who elected it.