You cannot tell if players like each other from what goes on at a club/stadium level.
Does Zlatan "hate" Lukaku after he was provoking him with that 'voodoo shit' comments? Lukaku is also a big, strong fellow. If you're not happy with him, you don't tell him, especially if you know he's too sensitive and emotional. Icardi on the other hand is like some scrawny kid, one punch and he's down. So expressing negative sentiments isn't really a two-way street. Not that many people have the @@ to insult people who under normal circumstances would beat the hell out of them. Not everyone is like Vidal. And you cannot really burst against the coach's pet.
At Chelsea we know that he doesn't really have the backing of the players, but he's the new guy there. He's not liked by any fanbase he's played for and that list did not really include Inter until last week. Everton, Manchester United, Inter and now Chelsea. No idea about Anderlecht but it's been so long and it's different times now so they'd probably be ecstatic to see him return.
Cannot comment on his Inter teammates, I know he has relations with guys like Eriksen, Hakimi, maybe Bastoni and Lautaro, but you cannot really tell these things.
You commented on Icardi, the guy appears to still be on good terms with former teammates, like Lautaro, Skriniar, Vecino, D'Ambrosio, Miranda and Ranocchia. Not many others are left actually. We cannot really know if that's a professional courtesy or genuine friendship, just because of social media, news articles or what you saw in the pitch. All we know is that he had a rift with Spalletti, Perisic, Brozovic and potentially Handanovic. And perhaps with Marotta, although we cannot know if that escalated beyond Wanda's tense relationship with Marotta. In the past he also was on bad terms with Osvaldo, true, but that's 2 players out of 50 that played with him. Osvaldo caused problems everywhere he went. Perisic had issues with Klopp.. It's not black & white like that. There were also rumours that Jovetic also disliked Icardi, but he had denied it in the media. Even if that's true, that's less than 5 cases in 70+ teammates and staff over the years.