Yes, it does sound like something many racists say. You treat "racist" like it only means someone who uses racial epithets. That's the tip of the iceberg. Looking at how people empower and disempower those of other races is the far more substantial and important measure.

I am laughing at your dismissal as "not a specific example". I linked to a very recent one upthread, and many many more are easily available and uncontroverted. He talked up a Muslim ban and campaigned on building a wall. You are being willfully blind on this one.

It absolutely is the responsibility of the president. He leads and sets the tone. He has influence over, for example, Daniel Cameron, and used it to encourage a lack of police accountability. He can control grant programs and discretionary spending in the area of policing. The DoJ can investigate police departments as part of their public integrity work, and has done historically little of that under this administration. And instead of calling Black Lives Matter a "symbol of hate" for reacting to a problem that his own Attorney General acknowledges (that there is systemic bias against black people in policing) he could press Congress and state leaders to address the issue.