Another way of saying that they have identified better investment opportunities.
It is quite childish to insist that someone who questions the value of Tesla must put their money on it. It’s akin to lame-ass playground bullying: “You don’t like that, so I dare you to eat it!”
This isn't a trading desk, this is an internet forum where opinions are worth points, and the points don't matter.
Setting up an account with a broker to do options trading requires a lot more capital or margin and requires a lot of research to understand puts/calls, hedges, etc. Buying stocks of other companies you believe will grow is a perfectly fine approach.
One can have an opinion about a company and not do anything with the stock. One can also have opinions about laws, political candidates and ice cream flavors and not do anything about them as well (at least in the US, other countries may silence political opinions).
No it doesn't, you just need a decent credit score and enough bravery/foolishness to click the "I know what I'm doing" box. Usually they'll have a higher level for margin trading and certain strategies that requires something extra but just writing secured contracts and buying options requires almost nothing.