The image in OP is what is toxic. Fostering a kind of echo chamber where the people who disagree with the prevailing narrative and bring reasoned arguments that contradict it get written off as "foreign agents" is extremely toxic, also nationalistic, and often borderline racist. It's also childish. Pointing out how childish it is to tell someone "you're just a RuSsIaN bOt!" because you don't like what they have to say is definitely not toxic, quite the opposite.