The part I bolded. Pride (Nationalism) in a country is an introverted concept, you're proud of your own country for it's achievements. Whereas xenophobia is an extroverted concept, you're bringing other countries into the fold and you're actively comparing and competing with the ideas and beliefs of others. When you talk about expansionism, surely that's more xenophobic than patriotism? Or at least that's how I interpret it.
I do not disagree with your definition totally, the only reason I replied to this topic was because I felt that people wrongly put violence/force at the core of Fascism when I do not believe it to be. A lot of what you've said I agree with, but I just feel that you/others emphasised other key themes over nationalism which is the base for the entire ideology. Perhaps the only slight issue I have with what you've said is that Fascism inevitably leads to segregation and wars/expansionism as a direct result of this nationalism.
If you're describing Nationalism (not sure what you mean by 'Proper' nationalism) like I am, as the pride in your own nation, then it's everywhere in Western civilisation today. European diplomats nowadays are nationalistic about their country and yet they find ways to co-operate with each other using methods other than physical conflict. On a smaller scale when visiting new countries natives are incredibly keen to show/tell me more about their culture because they're proud of it - yet from personal experiences I've never been forced to conform to their way of life. These examples, to me, display nationalism in a harmless way. Pride in your home country doesn't necessarily equate to wars/violence.
I won't be writing a full definition of Fascism as having studied aspects of it at university (albeit only a semester long module), I know it's a far bigger task than a few hundred words on here. Furthermore, it's a highly interpretive subject so there will never be a 'right' (excuse the pun) definition agreed upon by all.