Hasan is absolutely hated by Turks and Kurds. Despite moralfagging over the plight of the Palestinians and giving impassioned speeches about how much he hated genocide, he's calling the Kurds "spiritually MAGA" for launching a ground invasion of Iran.
What Hasan means by "what happened in Rojava" is that a part of Northern and Eastern Syria, broke away and became its own autonomous zone with equal rights for Kurdish people called Rojava. The Turkish government, Iranian mullah regime and Assadist Syria didn't like that and have been enacting ethnic cleansing and what could be called acts of genocide against the Kurdish people.
What Hasan is basically saying is "The Kurds shouldn't defend themselves or fight for anything, just roll over and let the bigger regional superpowers like the IRGC and the Turkish government continue to ethnically cleanse your people." To him, Hamas are freedom fighters who are being unfairly genocided by the Israelis, but the Kurds defending themselves from Iranian/Turkish/Syrian aggression should just give up.
Both Turks and Kurds think he's a fucking idiot:
As I've posted before, one of his tweets hit Turkish Twitter a few days earlier, which had other, more anti-government Turks piling in and calling him a "Fetocu" or "FETO supporter" for saying he would support every action by Erdogan if the US were to attempt regime change in Turkey.
For context, FETO is the "Gülenist Terror Organisation" ("Fethullahçı Terör Örgütü", FETÖ), a far right Islamic terrorist sect that led a failed uprising in 2016 against Erdogan's government. FETO used to be strong collaborators with Erdogan's government before they fell out. Hasan's father and family are also allegedly FETOists due to his father founding the similarly right wing Future Party, which is why the allegation is extended to Hasan himself.
Nationalists hate FETO and generally tar every other opposition branch to Erdogan as FETO even though they share some of the same ideals whilst disagreeing on who should hold power.
This is the simplest explanation I could write, please correct me if I am off-mark.
He's pissed off both Turkish Nationalists and Anti-Government Turks:
People called him out for being completely fucking silent on the opposition being suppressed for years:
People pointing out that his article in the HuffingtonPost wasn't as biting as he claimed it was:
After the Hasan posted the tweet crashing out, his fans piled in to defend his honor and/or thirst over him, that pissed off another turk: