Human nature is human nature. Much of how certain demographics will act or respond is predictable, but not always.
Gangs are generally well organized, have a built in hierarchy, stockpile guns and ammo, are experienced in acquiring resources by deception or force, have adjusted values that allow for certain deeds without hesitation, and are very comfortable with violence. In the aftermath of a SHTF event many gangs will likely grow in numbers quickly as survivors see that gang-membership can offer supplies and protection while government resources (if they manifest at all) seem to dry up, dwindle and disappear. This does not mean gangs will not face competition from MAG's, communities, pockets of police or military, etc. But gangs will likely control large areas of the inner city and urban areas, branching out as needed. Don't forget many gangs members have lived, survived and thrived in places that already seem like post-SHTF communities. They are not to be underestimated. They are also not automatically bad either. They are just as likely to keep the peace in areas they control as they are to cause problems. Gangs, like countries, are adept at developing treaties and alliances.
Snowflakes are generally all bark with no bite, they only have strength in numbers right up until they face actual opposition and their progressive ideology will surely change to fit their circumstances. The special snowflake crowd will either die off quickly or they will join any group that can do the things they cannot do. They will expect to be coddled or cared for, until that doesn't happen, then they will suddenly adjust their values. I would never trust a snowflake. Their thinking and thus decision making would seem to be too easily manipulated. The snowflake 'threat' lies not in the potential for confrontation, but in the potential for them to compromise you and your group.