In the word foreign it means different or from any other country. In many cases may people can insult an immigrant for being from an other country and can make them feel unwanted. So many people can feel like they don't fit in at any point. That is called bullying, so in my point of view I truly believe it is a negative connotation.
I believe that the word 'foreign' in many senses can bee deemed as a negative word. Although not all connotations of the word 'foreign' are negative, it has implications of the unknown, something which many people have grown to become afraid of. This uncertainty can be portrayed in many different emotions, disgust and hatred being strongly opinionated ones.
There is not generally a negative connotation to the word "foreign". It is generally means something different, or from another country, which in and of itself shouldn't be negative. There are certain communities and certain countries in which it does have a negative connotation. There "foreign" means an outsider, and not just someone from elsewhere, but someone who, because he or she is from elsewhere is somehow lesser. It shouldn't be a negative.
Yes, in some cases the word "foreign" can have a negative connotation. It can mean unknown or that it does not belong in the place that it is found. For example, a foreign object is often one that is unwanted. Likewise, a foreign idea is something that is difficult to understand.
Yes, there is a negative connotation to the word foreign, because a lot of people are afraid of the things that they do not now. Most people are not well traveled. So when they hear that something is foreign, it scares them, because they do not know about it. People just need to be exposed to foreign things.
This is from an American perspective. Two prime examples are "foreign-made" and "foreigners-immigrants." There is absolutely a negative association with both of these in particular. If you pay attention to advertising, it's clear that "made in the USA" is clearly superior to foreign made materials and items. Additionally, immigration is extremely negative to Americans. Most people don't realize that America has a history of a particular aversion to Immigrants.
If you read the Tanakh, God often speaks of foreigners in a very positive light. God tells the Israelites frequently to treat the foreigners in their country with the greatest of kindness. It is only modern fear (racism?) of immigrants that cause some to view it with a negative connotation.
I do not believe there is a negative connotation to the word foreign. Foreign can be used in many different ways and it does not carry a stigma with it. I think some people do use it in a derogatory manner sometimes, but that doesn't mean the word carries a negative connotation with everyone.