Pluto in the 11th house is by definition a lone wolf, as it tends to be the one who stands out in the crowd, the one who seems to be non-compliant with unspoken social rules of respecting the status quo.
Group dynamics always involve some sort of code - don't disrupt the peace, mind your business, don't address what needs to be addressed. Yeah, well that doesn't fly for this Pluto.
When someone has Pluto in the 11th house, not only do they have a tendency to exert their power in social dynamics, something that can be difficult for others to deal with, they also have a tendency to have insights about social dynamics that are disturbing for others to receive. Pluto here learns over time that there is something about them that just doesn't seem to "belong", creating often a self-created narrative of the lone wolf, the black sheep.
This isn't necessarily the case, but what's for sure is that there isn't a strong capacity to keep up the peace when in groups, and so Pluto here will prefer one on one relationships, where there are less parameters. Pluto seeks power and control, and group dynamics also require to let go of that, making it a tad more difficult for Pluto to operate.
Pluto is always where we seek power and where we do have possibilities of empowering others along with ourselves, but it's also where we tend to experience repulsion, compulsion, and obsession. Pluto in the 11th house tends to experience profound distrust of friends and groups dynamics. There is a tendency as well to have such an intense relationship to friends that most end up afraid or simply feel suffocated by the intensity.
Pluto's dynamic is: address it and empower yourself, or deny it and end up eaten by it. Pluto here has a tendency to seek control and power over social connections, and there is most definitely a shadow to address in order to achieve better relationships, but also in order to achieve what Pluto is truly after here: Being some sort of leader in a social or collective dynamic, in order to inspire and lead others to listen and follow their personal ideals and beliefs. Someone with Pluto in the 11th house can be some sort of leader, guru, guide, there can be a strength of ideals, very innovative and avant guards ideas, so the capacity to learn how to function in group settings is most definitely an important task.
Pluto in the 11th house perhaps doesn't belong, but Pluto in this house is also driven to just create their own space, where they will by essence belong, and invite others on their journey.
Personal readings available
"Pluto an evolutionary journey of the soul": By Jeff Green
"The book of Pluto": Steven Forrest