glucose is literally fuel for your brain.

It can be used as brain fuel, but the brain can also run on fat with less glycation end productions and low insulin.

It’s not bad.

Naturally regulated serum blood glucose is fine, consuming dietary glucose (including all carbs) is the problem - they drive insulin, which over a long enough period of time impacts the blood brain barrier with insulin resistance... people's brains literally are drowning in a sea of glucose they can't use because the insulin isn't arriving... fat does not have this problem.

Not to mention type 2 diabetes requires elevated blood glucose, a condition of glucose intolerance.

Eating raises your insulin levels sometimes because your body needs to process food

it's only "sometimes" if you don't eat carbs, if you eat carbs it's every time. This is how type 2 diabetes develops.