Homegrove there are no rules in someone replying to someone elseās twitter post. You could reply to it if you want. Itās just that most of the many posts which might be made in such a scenario are ignored.
Also, āhaving a sayā implies actually being involved in or having an influence on something - making a troll post on twitter doesnāt necessarily have mean you have actually have any influence on anything. Again, you could make some silly comment on twitter aimed at Musk or anyone else, but it doesnāt necessarily mean you actually have any influence on whatever it is youāre talking about.
Finally, if you donāt think he should āhave any sayā in this conflict, then would you rather he withdrew the Starlink internet access heās given to Ukrainians?!