You say "right winger" much the way the left says "nazi". Being right or left shouldn't automatically be cause for someone to dismiss your opinions.
It doesn't matter how much someone hates politics, despairs of party politics, says "But both parties suck", once they've put hundreds of comments into discussions in a political forum any attentive reader should know roughly where they stand on the left-right axis.
There aren't many absolutes: some right wingers will prefer Biden to Trump, some left wingers Trump to Biden. But given the colossal level of global disrespect for Donald Trump, trying to argue Biden has a worse global image than Donald Trump did as president is so obviously
factually wrong that by far the highest likelihood is right-wing bias.
I get it. For most right-wingers, Trump was their president. At that point, to admit that they supported a colossal shitshow of a president has a huge cognitive pain attached. What is the saying: "Who is the greater fool: the fool or the fool who follows him?" Who wants to admit something which creates the conclusion they were a fool?