Neoliberals do have specific positions that are often viewed negatively, or with which many on the political left disagree.

So briefly, I would define neoliberalism as a market based view of social outcomes, and free trade oriented policies, albeit with some degree of regulation to ensure fair play.

One example that people might point to, with regards to negative effects of neoliberalism, is the European Union. Especially going back to around 2012 or so, there was massive unemployment in smaller european countries that were less competitive in terms of trade. In greece the youth unemployment rate reached 50%, and many blame neoliberal oriented policies like a common currency, removal of trade barriers, austerity politics, etc.

Obviously many populist/nationalist movements whether brexit or trump dislike many neoliberal ideas, free trade and immigration.

I don't want to get into my own views or critiques. But while I may agree with many neoliberal goals, values, and the practical aspects(big tent, willingness to compromise), I think that some of the prevailing neoliberal principles are flawed in their applications.

But the biggest thing you have to understand is just the mentality of leftism, its a very "us vs them" attitude. Even when I agree with specific left policies, I may not like the approach. For example, if a policy is wildly unpopular with 40% of the country, I would rather not implement it, even if I personally like the policy. I generally think that most social programs should have broad support so you aren't playing this crazy tug of war with legislation.

While I may support free college, student loan forgiveness, universal health care, I don't want to see a program pass just to "win", I want to see programs that have broad support that don't require tons of compromise and fandangling. I'm not set on one specific solution. Aside from some basics like civil rights, I generally don't like to see controversial policies shoved through.

Many left people do not have this attitude. They want their policies implemented at all costs, and view any resistance as an offense that is actively hurting people. They rightfully point to negative labor or healthcare outcomes as harm, but at the same time, the solution is always some specific policy, even for very complex issues like healthcare or education.

Finally, specific politicians seen as neoliberal may be particularly unpopular, especially with the political left. Is it any wonder with the recent presidential primary politics? It may seem like some of these politicians are rich and out of touch. Or it could be said they are only protecting corporate interests or the status quo.

I mostly just follow this sub because it is so active and actually has real discussions. I am more policy aligned with left people, although perhaps in a practical sense I am neoliberal in terms of the political process. I don't see politics as something to be won or lost for your cause, but something that just takes work so that you can balance competing interests. So I am more interested in compromise, just as part of the political process, than most people on the left.