I'll only eat you if you're rich.
The person in question didn't argue against green energy, they argued for local European solar industry. While one of the consequences in this case could be Europe being able to install less solar, this is something to introduce in your counterargument, highlighting the consequences.
Being hostile drives people away, and this particular commenter is probably not a decision-maker in European solar, so you're not missing anything if you kindly introduce an alternative point of view. It is politicians in office that we should pressure, as they have something real to lose when we don't support them. Shitting on regular people, on the other hand, will simply get your opinion ignored.
I outline the very same arguments as you in the same thread - and on the substance, I 100% agree. The question is to form, and it is more important than what you make it out to be.
The reason I talk about the way you express your concern is because the more we yell at each other and try to "expose" each other acting in bad faith, the more division grows between people and the harder it gets to actually convince anybody of anything. Anger and unfounded blame game repels, not convinces.