I would personally put excessive gun ownership and exaggerated desire to make use of them above Fahrenheit. The current administration as well. Obesity and addiction to opioids also, come to think of it. And I have a feeling I'm forgetting a few other issues.

You could make an argument that the cultural undertones of hardcore individualism and striving for selfish monetary success lie at the bottom of a lot of those issues. And maybe a desire to want to go their own way informed the opposition to Celsius and the metric system as a whole. I would not make this choice the poster boy for what's wrong with the US though.

Both temperature scales are made up. Both are workable. Both come from Europe. Where if it wasn't for enlightenment, the French Revolution, and Napoleon (events far away from the New World) we might still also measure in cubits, pounds, and regional tworps. Horses are still measured in hands, deer in points (I think, not sure about that one). The Brits still delight us with mph speed limits on their motorways and body weight measured in stones. Worldwide the more commonly used calories are a member of team imperial, not metric. Bicycles and screen sizes are more commonly measured in inches in Europe as well. Celsius had put 0° as the boiling point of water initially so we're all using it wrong, I say with tongue very much in cheek. The US opposition to going full metric is a bit dumb but not unique at all. The Japanese measure apartments in tatami mat sizes.

What's intetesting about the US imperial system of measurements is that if you scratch under the surface it is mostly if not all of it propped up by the metric system. Lawful definitions of how long an inch is and how hot 98.6 °F is are expressed in terms of the metric system as the worldwide standard. So they are at the core fully metric, they just don't know about it.