Almost by definition, if something is an issue, then society, or a large section of society, complains about it. This means that another way of putting this question is to ask what situations or actions used to be issues, but no longer are. Here are a few suggestions.
1. Casualness in dress. Until the 1960s, even appearing in public without a hat would excite comment. President John F. Kennedy was known as "Hatless Jack" for his propensity to do so. Except for workplace dress codes, people now wear whatever they like to a degree that used to be unthinkable.
2. Cursing. This has become much more widely accepted in mainstream society, particularly on television shows.
3. Homosexual relationships. A few people still complain very vociferously about this issue, but it has become a niche concern, with marriage equality becoming widely accepted in mainstream society. The same is true of interracial relationships.
4. Public displays of affection. This depends upon context, but even kissing and holding hands in public were once frowned upon.
5. Conspicuous consumption. It used to be regarded as vulgar and to excite adverse comment when people used ostentatious status symbols to display their wealth. Now, such people are often admired for their conspicuous displays of material success.