So much media about the fall of the Berlin Wall and dissolution of the USSR paint it as a "global celebration", but how did socialists in the West feel about it? What were the statements made by the large socialist parties in Spain or France? What about the small amount of socialists living in the US or Canada, or the large amount of socialists living in Latin America?
This is a big question, especially considering the huge differences among the various groups of people that could be described as "socialists" around 1990. I don't have time to look up a lot of stuff right now and I'm only somewhat qualified to answer with regards to Western Europe.
So considering the "large socialist parties" of Western European countries, I think it is fair to say that they would in fact all be better described as social democrats by that time. In France (Mitterand), Spain (González), Italy (Craxi), and West Germany / FRG (Brandt, Schmidt), they had all at least once been in power during the Cold War in what were firmly "Western" / anti-Soviet countries - NATO members after all! So they had in principle all long stopped believing that what was going on in the Eastern bloc was a viable path towards a better society (which they might or might not still have equated with some idea of "socialism" in their official party platforms at that time); probably the latest after the crushing of the [Prague spring] (http://en.wikipedia.org/wiki/Prague_Spring).
The situation was of course special in Germany, where the dissolution of the Eastern bloc paved the way towards reunification. Former social democratic FRG chancellor (head of government) Willy Brandt is famously quoted as saying "what belongs together now comes together" shortly after the Berlin Wall fell (and before it was clear that reunification would be quickly achieved).
More radical "socialists" / communists in post-1968 "alternative" leftist movement in the West were in general not big fans of the Eastern bloc bureaucracies either. I remember reading in the introduction to a later German edition of [Fire and Flames] (https://www.worldcat.org/title/fire-and-flames-a-history-of-the-german-autonomist-movement/oclc/797820611), a history of the West German / West Berlin Autonomen movement, how the author (an activist using the pen name "Geronimo") struggled with using the term Genosse (comrade), considering that "someone like Erich Mielke" (head of the Stasi) would also have been addressed like this.
There were also "orthodox" (basically Stalinist) communists in the West to be sure, who would deplore the demise of the Soviet bloc (and basically still do), but they were really marginal by that time; in West Germany those would mainly be represented by the (heavily GDR-funded) DKP (Deutsche Kommunistische Partei).
(Edited for typos.)