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Hello. So I have GNOME and XFCE installed, without any display manager. I start XFCE by running startx, and my .xinitrc has this: exec startxfce4. Using htop, I've realized that some processes running don't belong to the XFCE environment (I suppose):

Those processes were started by systemd, but since I'm running a XFCE session, I don't need the GNOME stuff.
$ systemctl status 638
● user@1000.service - User Manager for UID 1000
Loaded: loaded (/usr/lib/systemd/system/user@.service; static; vendor preset: disabled)
Active: active (running) since Sat 2017-04-08 16:01:26 -03; 56min ago
Main PID: 443 (systemd)
Status: "Startup finished in 248ms."
Tasks: 52
CGroup: /user.slice/user-1000.slice/user@1000.service
├─at-spi-dbus-bus.service
│ ├─576 /usr/lib/at-spi2-core/at-spi-bus-launcher
│ ├─599 /usr/bin/dbus-daemon --config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork --print-address 3
│ └─603 /usr/lib/at-spi2-core/at-spi2-registryd --use-gnome-session
├─dbus.service
│ ├─ 511 /usr/bin/dbus-daemon --session --address=systemd: --nofork --nopidfile --systemd-activation
│ ├─ 517 /usr/lib/xfce4/xfconf/xfconfd
│ ├─ 627 /usr/lib/gnome-online-accounts/goa-daemon
│ ├─ 635 /usr/lib/gnome-online-accounts/goa-identity-service
│ └─1098 /usr/lib/dconf/dconf-service
├─gvfs-afc-volume-monitor.service
│ └─645 /usr/lib/gvfs/gvfs-afc-volume-monitor
├─gvfs-daemon.service
│ ├─ 554 /usr/lib/gvfs/gvfsd
│ └─1083 /usr/lib/gvfs/gvfsd-trash --spawner :1.14 /org/gtk/gvfs/exec_spaw/0
├─gvfs-goa-volume-monitor.service
│ └─611 /usr/lib/gvfs/gvfs-goa-volume-monitor
├─gvfs-gphoto2-volume-monitor.service
│ └─641 /usr/lib/gvfs/gvfs-gphoto2-volume-monitor
├─gvfs-metadata.service
│ └─1079 /usr/lib/gvfs/gvfsd-metadata
├─gvfs-mtp-volume-monitor.service
│ └─606 /usr/lib/gvfs/gvfs-mtp-volume-monitor
├─gvfs-udisks2-volume-monitor.service
│ └─579 /usr/lib/gvfs/gvfs-udisks2-volume-monitor
├─init.scope
│ ├─443 /usr/lib/systemd/systemd --user
│ └─445 (sd-pam)
└─pulseaudio.service
└─544 /usr/bin/pulseaudio --daemonize=noWhy PID 603 has --use-gnome-session and how can I disable it? Uninstalling GNOME isn't an option, since I still use it sometimes. My question is, how can I disable gnome-online-accounts, gvfs-*, and any other program that doesn't belong to the XFCE environment? I am not using any GNOME program in the startup:

Thanks.
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