I can understand the Ukrainian soldiers calling the Russian troops "orcs". Yes, it's dehumanising, but it's not easy for most soldiers to kill another human being when you can actually see them (i.e. when they are in individually-visible eyesight range), as many studies have shown - so part of their training is designed to overcome this natural barrier.
De-humanising the enemy military is a psychological aid to this process. And if you are fighting a war where it's kill or be killed, there is no space for niceties.
However, extending this to the civilian population of the enemy nation is wrong and not helpful. Some people disagree and say that the civilian Russians support Putin, but this is not by any means especially true or fair. For starters, I'd guess that many Russians don't support Putin, but can't do much about it and so just keep their heads down. And we can hardly rely on Russian voting numbers for evidence of Putin's popularity - these are as rigged as anything else in Russia, with state control of all media and political opponents murdered or jailed. Moreover, many Russians simply don't know what is being done in Ukraine - because the only info they get is from the state media.
Of course there are Russians who do support Putin, quite a lot of them I imagine, but some of that support will be based on lack of knowledge. I don't know what proportion of Russians are ultra-nationalists who positively like Putin's dictatorial rule and aggression, but I'd guess it's a minority.